Patent attributes
A display apparatus driving circuitry for driving a plasma display panel. A first transistor is electrically connected between an output terminal and a high-voltage power supply terminal. A second transistor is connected between the output terminal and a reference power supply terminal. A buffer circuit supplies a voltage lower than a low voltage VDL for logic to a gate of the second transistor to make a drop in an output waveform gradual during an address electrical discharge. In a preferred embodiment, during this drop in the output waveform, a p-channel type MOSFET of the buffer circuit is turned on, whereby the VDL is suppressed due to a back gate effect. Therefore, a signal at a potential lower than the VDL is inputted to the gate of the second transistor. As a result, the drop in the second transistor output waveform is gradual, so that noise and damage are prevented.
